Ceiling swirl diffusers in air conditioning systems create a swirl to supply air to rooms. The resulting airflow induces high levels of room air, thereby rapidly reducing the airflow velocity and the temperature difference between supply air and room air. Ceiling swirl diffusers allow for large volume flow rates. The result is a mixed flow ventilation in comfort zones, with good overall room ventilation, creating only very little turbulence in the occupied zone.

Type FD ceiling swirl diffusers have fixed blades. Air discharge is horizontal omni directional. The supply air to room air temperature difference may range from –12 to +10 K.

To give rooms an aesthetic, uniform look, Type FD diffusers may also be used for extract air.

Nominal sizes

300, 400, 500, 600, 625 mm

Minimum volume flow rate, with ΔtZ = –6 K

9 – 28 l/s or 31 – 102 m³/h

Maximum volume flow rate, with LWA ≅ 50 dB(A)

70 – 235 l/s or 252 – 846 m³/h

Supply air to room air temperature difference

–12 to +10 K

Quick sizing tables provide a good overview of the volume flow rates and corresponding sound power levels and differential pressures.

The minimum volume flow rates apply to a supply air to room air temperature difference of –6 K.

The maximum volume flow rates apply to a sound power level of approx. 50 dB (A) with damper blade position 0°.

Exact values for all parameters can be determined with our Easy Product Finder design programme.

FD-*-Z-H (supply air), sound power level and total differential pressure

Nominal size

V

Damper blade position

Nominal size

V

0°

45°

90°

Nominal size

V

Δpt

LWA

Δpt

LWA

Δpt

LWA

Nominal size

l/s

m³/h

Pa

dB(A)

Pa

dB(A)

Pa

dB(A)

300

9

31

1

<15

1

<15

2

<15

300

35

126

13

28

17

27

27

27

300

55

198

31

39

41

40

67

39

300

80

288

67

50

87

54

142

54

400

16

59

1

<15

1

<15

2

<15

400

60

216

10

24

14

25

27

26

400

105

378

32

39

42

40

83

44

400

145

522

60

50

81

53

158

57

500

24

85

1

<15

2

<15

4

<15

500

80

288

12

24

19

26

43

29

500

135

486

33

39

53

41

123

45

500

185

666

62

50

99

54

231

58

600, 625

28

102

1

<15

1

<15

3

<15

600, 625

95

342

10

25

15

25

29

24

600, 625

160

576

28

39

41

40

81

39

600, 625

225

810

55

50

81

52

160

53

FD-*-Z-V (supply air), sound power level and total differential pressure

Nominal size

V

Damper blade position

Nominal size

V

0°

45°

90°

Nominal size

V

Δpt

LWA

Δpt

LWA

Δpt

LWA

Nominal size

l/s

m³/h

Pa

dB(A)

Pa

dB(A)

Pa

dB(A)

300

9

31

1

<15

1

<15

2

<15

300

30

108

9

25

11

25

19

25

300

50

180

26

38

32

38

54

38

300

70

252

51

49

62

49

106

49

400

16

59

1

<15

1

<15

2

<15

400

60

216

10

24

13

23

23

24

400

105

378

31

39

40

39

72

42

400

145

522

60

50

77

51

138

55

500

24

85

1

<15

1

<15

4

<15

500

80

288

11

24

14

23

44

29

500

130

468

28

38

36

39

117

44

500

180

648

54

50

70

53

223

56

600, 625

28

102

1

<15

1

<15

2

<15

600, 625

95

342

9

25

12

24

28

27

600, 625

160

576

26

40

35

41

78

44

600, 625

220

792

50

51

67

55

148

57

Ceiling swirl diffusers with square or circular diffuser face. Supply air and extract air variants for comfort zones. Diffuser face with fixed air control blades for horizontal swirling supply air discharge creating high induction levels. For installation into all types of suspended ceilings.

Ready-to-install component which consists of the casing, diffuser face, spigot, and a cross bar to which the diffuser face is fixed.

The diffuser face is fixed to the cross bar with a central screw.

Spigot suitable for ducts to EN 1506 or EN 13180.

Sound power level of the air-regenerated noise measured according to EN ISO 5135.

Special characteristics

High induction results in a rapid reduction of the supply air to room air temperature difference and airflow velocity

For all types of ceiling systems, and with an extended border also suitable for freely suspended installation

Horizontal or vertical duct connection

Air change rates of up to 35 per hour can be achieved by arranging several diffusers in a row with a minimum pitch of 0.9 m (centre line to centre line)

Variants, Dimensions and weight, Product details

Variants

Dimensions and weight

Product details

FD-Q

FD-Q-*-H

Designed for high comfort

Together with renowned designers and architects we have developed ceiling, wall, staircase and floor diffusers and grilles that are not only aesthetic design elements, but also meet demanding ventilation and acoustic requirements.

Variant

Ceiling swirl diffuser with square diffuser face

With plenum box for horizontal duct connection

Nominal sizes

300, 400, 500, 600, 625

Parts and characteristics

Square diffuser face

Plenum box for horizontal duct connection

Square opening to accommodate the diffuser face

Equalising element that ensures a uniform airflow through the diffuser face (supply air variant)

Simple installation of the diffuser face due to central fixing screw with decorative cap

Spigot with groove for lip seal (if accessory lip seal has been ordered)

FD-Q-*-V

Designed for high comfort

Together with renowned designers and architects we have developed ceiling, wall, staircase and floor diffusers and grilles that are not only aesthetic design elements, but also meet demanding ventilation and acoustic requirements.

Variant

Ceiling swirl diffuser with square diffuser face

With plenum box for vertical duct connection

Nominal sizes

300, 400, 500, 600, 625

Parts and characteristics

Square diffuser face

Plenum box for vertical duct connection

Circular opening to accommodate the diffuser face

Equalising element that ensures a uniform airflow through the diffuser face (supply air variant)

Simple installation of the diffuser face due to central fixing screw with decorative cap

Damper blade for volume flow rate balancing (optional)

Lip seal (optional)

Construction features

Spigot suitable for circular ducts to EN 1506 or EN 13180

Spigot with groove for lip seal (if accessory lip seal has been ordered)

FD-R-*-H

Designed for high comfort

Together with renowned designers and architects we have developed ceiling, wall, staircase and floor diffusers and grilles that are not only aesthetic design elements, but also meet demanding ventilation and acoustic requirements.

Variant

Ceiling swirl diffuser with circular diffuser face

With plenum box for horizontal duct connection

Nominal sizes

300, 400, 500, 600, 625

Parts and characteristics

Circular diffuser face

Plenum box for horizontal duct connection

Circular opening to accommodate the diffuser face

Equalising element that ensures a uniform airflow through the diffuser face (supply air variant)

Simple installation of the diffuser face due to central fixing screw with decorative cap

Spigot with groove for lip seal (if accessory lip seal has been ordered)

FD-R-*-V

Designed for high comfort

Together with renowned designers and architects we have developed ceiling, wall, staircase and floor diffusers and grilles that are not only aesthetic design elements, but also meet demanding ventilation and acoustic requirements.

Variant

Ceiling swirl diffuser with circular diffuser face

With plenum box for vertical duct connection

Nominal sizes

300, 400, 500, 600, 625

Parts and characteristics

Circular diffuser face

Plenum box for vertical duct connection

Circular opening to accommodate the diffuser face

Equalising element that ensures a uniform airflow through the diffuser face (supply air variant)

Simple installation of the diffuser face due to central fixing screw with decorative cap

Damper blade for volume flow rate balancing (optional)

Lip seal (optional)

Construction features

Spigot suitable for circular ducts to EN 1506 or EN 13180

Spigot with groove for lip seal (if accessory lip seal has been ordered)

Freely suspended installation only with an extended border (supply air variant)

Horizontal or vertical duct connection

If necessary, carry out volume flow rate balancing with the damper blade

These are only schematic diagrams to illustrate installation details.

AK-Uni-...-MN Volume flow rate balancing

① Damper blade
② White cord for opening the damper blade

Open, 0°

Volume flow rate balancing

When several diffusers are connected to just one volume flow controller, it may be necessary to balance the volume flow rates.

Ceiling diffusers with universal plenum box and damper blade (variant -M): The diffuser face can be removed to access the damper blade; the damper blade can then be set to any position between 0 and 90°

Ceiling diffusers with universal plenum box, damper blade and pressure tap (variant -MN): The diffuser face need not be removed since the damper blade can be set with two cords (white and green).

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Your message is send and will be processed shortly.Our department for Service-Requests will contact you asap.For general question regarding products or services you can also call:Tel.: +49 (0)2845 / 202-0 | Fax: +49 (0)2845/202-265